Question

Which one of these is neither a prime number nor a composite number?

• A. 4
• B. 2
• C. 7
• D. 1

Answer 1

The correct option is D 1

A prime number is a number which has only two factors, 1 and the number itself.
A composite number is a number which has more than two factors.
Hence, from the above two statements we can conclude that, 1 is neither prime nor composite.